While the device simulator in the in-browser client does have some relation to WebKit, we are constantly working on improving and modifying it and introducing support for the various features that our users might require.
As I explained, using the SQLite plugin
(which in the simulator resorts to WebSQL) works as expected. All you need to do is clone the sample
and run it in the simulator to check how it works.
Let us know if you need further help. Thanks!
Share what you think about AppBuilder and Telerik Platform with us in our feedback portal, so we can become even better!